Linux support

[Freso]

Apparently, Linux isn't supported (yet):

#ifdef TSW_WEBVIEW_WIN32
#include "windows/webview-windows.h"
#elif defined(TSW_WEBVIEW_WKWEBVIEW)
#include "mac/webview-wkwebview.h"
#else
#error "Not supported on this platform yet."
#endif

This plugin would be very useful on Linux too, so this is a formal request for Linux support. :)

[caitp]

Pull requests welcome! — But to be honest, I’m not even sure this is still working, if twitch’s API or libobs has changed since the initial work.

This thing really needs a general redesign, maybe embedding WebKit (we might get QtWebKit for free with libobs?) instead of trying to use platform browser components.